Smithson tennant biography of abraham

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    The Early History of Synthetic Diamond

    THE AUSTRALIAN GEMMOLOGIST | The Early History of Synthetic Diamond

    James Evans, EG, Lustre Gemmology
    James@LustreGemmology.com

    Acknowledgements

    The author gratefully acknowledges support from Peter Müller at the Dresden State Art Collections for an image of “The Lens of the Royal Palace”; Robin Hansen from the Natural History Museum, London, for an image of one of James Hannay’s diamonds; and Judy Colbert and the Richard T. Liddicoat Gemological Library and Information Center (GIA), for an image of five crystal specimens (submitted to the GIA laboratory by J. Willard Hershey). The author is also indebted to Léonie Rennie for her comments on numerous drafts of the manuscript.

    Abstract

    As synthetic diamonds become increasingly prominent in the jewellery market, this article honours the incremental steps taken by scientists, over a quarter of a millennium, to understand and ultimately replicate the world’s most valuable gemstone.

  • smithson tennant biography of abraham

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    Asimov's Biographical Encyclopedia of Science and Technology

    EntryNameFieldNotes 1ImhotepEngineering(2650–2600 BC) An Egyptianpolymath, he is considered to be the first engineer, architect and physician in history known by name. 2AhmoseMathematicsAlso known as Ahmes, an Egypt scribe of the Second Intermediate Period of Egypt who copied the Rhind Mathematical Papyrus. 3ThalesMathematics(624 – c. 546 BC), One of the Seven Sages of Greece. He is one of the first well-known philosophers and mathematicians. 4AnaximanderMetaphysics(c. 610 – c. 546 BC) A pre-SocraticGreek philosopher who lived in Miletus,[1] a city of Ionia (in modern-day Turkey). He belonged to the Milesian school5AnaximenesMetaphysics(c. 585 – c. 528 BCE) An Ancient GreekPre-Socraticphilosopher.[2][3] One of the three Milesian philosophers 6XenophanesMetaphysics(c. 570 – c. 475 BC)[4] was a Greekphilosopher, theo

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    Prepared for the 41st IUPAC General assembly in Brisbane, Australia June 29th - July 8th, 2001BNL-NCS-68350-01/10-REV


    Norman E. Holden*
    National Nuclear information Center
    Brookhaven National Laboratory
    Upton, New York 11973-5000 USA

    INTRODUCTION

    What do we mean by a chemical element? A kemikalie element fryst vatten matter, all of whose atoms are alike in having the same positiv charge on the nucleus and the same number of extra-nuclear electrons. As we shall see in the following elemental review, the ursprung of the chemical elements show a wide diversity with some of these elements having an ursprung in antiquity, other elements having been discovered within the past few hundred years and still others have been synthesized within the past fifty years via nuclear reactions on heavy elements since these other elements are unstable and radioactive and do not exist in naturlig eller utan tillsats .

    The names of the various kemikalie elements komma from many sources including mythological concepts or characte